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J. HERBERT SHEDD, OF'WALTHAM, MASSACHUSETTS.

Laws Patent No 88,259, dazed March 23, 1889.

IMPROVEMENT IN LIQUID-METERS The Schedule referred to in these Letters Patent and making part of the same.

To all whom it may concern Beit known that I, J. HERBERT SHEDD, of Waltham, in the county of Middlesex, in the State of Massachusetts, have invented a new and useful Improvement in in Meters, which can also be applied to pumps and engines; and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the accompanying drawings, making a part of this specification, and to the letters of reference marked thereon.

The application of my invention, represented in the accompanying drawings, is to a modification of the improved rotary pump, for which a patent was granted to.

your petitioner and William Edson, on the 19th day of January, A. D. 1864.

In practically working the invention secured bysaidpatent, I found the shock arising from stopping and starting the fans to be injurious; and a principal purpose of my invention is to accomplish the object gained by stopping the fans, and yet, at no time while the apparatus is working, to allow a fan to come to a complete stand-still.

The construction and arrangement of the apparatus thusrepresented are as follows:

Figure l is a perspective view of the exterior.

Figure 2 is a front elevation.

Figure 3 is a crossfsection.

Figure 4 is a longitudinal section.

Figure -5 is an elevation of the gear-wheels.

Similar letters refer to similar parts.

l A is a cylinder, or chamber, of any suitable material, forming the body of the meter, in which the fans revolve.

B is a movable head to the cylinder, to complete the chamber in which the fans-revolve.

C is a cover enclosing the gear-wheels, and made fast to the body, A, with a water-tight joint, and forming a secondary chamber' enclosing the gear. Fluid under pressure in the cylinder A, might, to a limited extent, escape around -the several-shafts and be lost,

or cause annoyance; but with the secondary chamberv made fast to the primary chamber, by a tight joint, a vessel is formed, having only one opening, beside the ports, and that of such a nature as to be easily made tight by a stning-box, thus preventing the final escape of any fluid. Y

D E F are, respectively, fans, or blades, which revolvewithin the cylinder A, -each alternately acting as a plunger and then as a diaphragm, by reason of avarying velocity, and thus, when in motion, constantly emptying and filling the cylinder with the tluid allowed to pass through it.

G H I are, respectively, eccentric-gear wheels, one of which is attached to each fan, and giving to it the varying. velocity required.

J K L are, respectively, eccentric-gear wheels, answering to and working with the gear-wheels G H `I, and, being held in a xed position in relation to each other on their axis, they insure the proper relative pothe escape of fluid from this opening through the shell of the water-tight vessel.

O is the inlet for fluid, and is to be attached to the supply-pipe.

P is the outlet for fluid, and'is to be attached to the service-pipe.

The operation of the apparatus thus represented is as follows: r i

A uid being admitted, under pressure,through the inlet O, and having free escape through the outlet P, will act with equal-pressure upon the fans D and F, but in their position as' represented, the fan Dacts, by the short line of its gear, into a long line of its corresponding gear, and thus exerts considerable power to turn the axis M, while the fan F acts, by a long line of its gear, into a short line of its corresponding gear, and thus exerts much less power to turn the axis M.

The gear-wheels on the axis M are firmly attached to each other and to the axis, and the fan exerting the greater pressure will move forward with the fluid-pressure, and carry with it the other fan against the pressure.

` By calculation, I find, that in an apparatus on the scale represented in the drawings, the fan D will move forward with a surplus power of one and seventy-eight hundredths (1l-7686) pounds for every foot head of water brought upon it, after .furnishing suiiicient power to carry the t'an F- against thepressnre. The motion of the fan D will also be much more rapid than that of the fan F, and will tend to overtake it on the outlet-side of the 'cyliuder, thus forcing out 4fluid on that side, while the distance between the fans is increased on the inlet-side of the cylinder, thus tending to form a vacuum, which will be filled by iiuid owing through the inlet-pipe.

I have referred to the fan F, in this description, as a diaphragm, but in the position represented ih the draw-v ings it will soon cease to act as such, and be idle for a time, though still in motion, while its place is s npplied 'by the fan E.

As the fans continue to revolve, F becomes aplunger, with a rapid motion, while D, running gradually slower, and idle for a time, though still in motion, finally takes its turn as a diaphragm, and then again more rapidly, to be a plunger.

Thus the fans, acting together, and constantly in motion, empty and ill the cylinder continuously; a

given quantity of fluid is dischargedY at each revolutionv I do not herein allege the invention of any device claimed in the patent for a meter, of even date here- Wit-h, to S. P. Ruggles; but

I claim- 1. The fans D E F, within a cylinder, so arranged that one of them shall operate as a plunger, another moving tardily as a diaphragm, and the third heilig measurably ineffective in its transition from the condi- .tion of a diaphragm to that of a plunger, or from the condition of a plunger to that of a diaphragm, all operated by means substantially as described.

common centre, in the manner and for the purpose herein shown.

3. The arrangement of the fan-chamber and the 4gearing-charnloen containing the parts hereinbefore recited, within a case, A, and cap C, whereby the whole shall be protect-ed, with the occurrence of but one single joint, all-as and for the purpose shown.

J. HERBERT SHEDD. Witnesses:

GEO. S. BOUTWELL, HENRY F. FRENCH. 

